The Bf 110D was a long range version of the Bf 110C.It was developed in part to deal with the long distances involved in the campaign in Norway, and also to give it a longer effective range as an anti-shipping aircraft.The D-1 was the first attempt at producing a long range version of the Bf 110. It had a massive 1200 litre/ 198 gallon external belly tank below the fuselage. This had a massive impact on the aircraft’s performance.